井盖模具用于遮盖道路或家中深井,防止人或者物体坠落，防止车辆行驶轮胎掉入井内被卡住，模具形状尺寸多样,常用尺寸样式有方形和圆形，那方形和圆形的井盖模具在使用上哪一种更好呢！
The manhole cover mold is used to cover the road or deep well at home to prevent people or objects from falling, and prevent the vehicle driving tire from falling into the well and getting stuck. The mold has various shapes and sizes, and the commonly used size styles are square and round. Which one is better in use!

井盖上随时有车辆行人经过,使用圆形,主要是考虑到圆形的井盖通过其圆心的每条直径长度都是一样的,这样如果井盖被经过的车辆轧起时,因为不论如何轧起,它直径都会比下面的井口略宽,井盖不会掉到井口里去。
There are vehicles and pedestrians passing through the manhole cover at any time. The circular manhole cover is mainly considered that the length of each diameter of the circular manhole cover passing through its center is the same. In this way, if the manhole cover is rolled up by passing vehicles, its diameter will be slightly wider than the wellhead below, and the manhole cover will not fall into the wellhead.

如果采用方形,因为方形的对角线明显长于其它每条边长,边长与对角线之比为一比根号二。这是因为这样的井盖被轧起时,很容易沿井口的对角线方向掉进井中。这里就牵涉到一个材料的****利用和节约的问题，造成浪费材料。
If the square is used, because the diagonal of the square is obviously longer than each other, the ratio of the side length to the diagonal is one to two. This is because when such a manhole cover is rolled up, it is easy to fall into the well along the diagonal direction of the wellhead. This involves the maximum use and saving of materials, resulting in waste of materials.